Bitcoin (BTC) is the first decentralized digital currency in the world, created in 2009 by an unknown person under the pseudonym Satoshi Nakamoto. Bitcoin relies on blockchain technology, which is a digital record of transactions distributed across a network of computers.

Bitcoin is characterized by several features that make it unique, including:

* Decentralization: Bitcoin is not controlled by any government or financial institution.

* Transparency: All Bitcoin transactions are recorded on the blockchain, and they are accessible to everyone.

* Scarcity: The maximum number of Bitcoins is 21 million, making it a scarce currency.

Bitcoin is used as a means of payment and financial transfers, and it is also used as a store of value. Bitcoin has experienced significant growth in its value since its creation, making it one of the most valuable digital currencies in the world.